> on the understanding it was reasonably hackable and open
I, honestly, have no idea why you thought that. Bambulab has been under fire from the very beginning about not being open at all and not contributing back to the open source community they're build on.
I bought one of their printers during black friday too, it took me a long time to get over the fact that it isn't an open printer, and I never want to go back to tinkering for hours to get meh quality prints.
And let them be closed-source as long as they give you ability to print without calling home or even without internet connection.
loading story #42767784